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I have a bunch of music videos I have downloaded from youtube. I usually put them in a playlist in mpc (Media Player Classic). The problem is that the audio levels of the videos are quite different and I have to adjust the volume for each one.

If I hear them in foobar2000 (it's an audio player) there's no problem because it can apply the replaygain info wich I have added to the videos, but mpc hasn's this feature.

Mpc has a normalization option but it is dynamic and is not what I want.

An aceptable solution would be to recode the video with the audio levels corrected. But I want to move the audio level globally to the video, not dynamic normalization. And also I want to leave the video untouched. What tool can I use?

5

FFmpeg, a free command-line tool, has a volume filter that should do this.

Syntax would be

ffmpeg -i input.mp4 -c:v copy -af volume=replaygain=track output.mp4

The af invokes the volume filter with the option set to adjust the volume using the track replaygain value (if present). Video is set to passthrough into the output.

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